PressurePen is an open source hardware project on Kickstarter to create a pressure sensitive stylus for iPad and Android tablets. The creators are hoping to raise enough to create 1,000 retail-ready styli, and give away the schematics, circuit diagrams, and STL files for all the machined and plastic parts.

In addition to receiving one of the final products as a reward for your backing, you can choose a prototype to test and tinker with, or a kit to build your own.

Take a look at the Kickstarter page here: http://www.kickstarter.com/projects/option8/pressurepen-open-source-pressure-sensitive-stylus